Physics of Radiation Effects in Crystals by R. A. Johnson

By R. A. Johnson

"Physics of Radiation results in Crystals" is gifted in components. the 1st half covers the overall historical past and thought of radiation results in crystals, together with the speculation describing the new release of crystal lattice defects through radiation, the kinetic method of the examine of the disposition of those defects and the results of the diffusion of those defects on alloy compositions and stages. particular difficulties of present curiosity are handled within the moment half and contain anisotropic dimensional adjustments in x-uranium, zirconium and graphite, acceleration of thermal creep in reactor fabrics, and radiation harm of semiconductors and superconductors.

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At the same time, due to the repulsion, the 1 n 1 0 30 P. Ehrhart et al. Fig. 11. hep interstitial configurations: (a) c-dumbbell, (b) octahedral, (c) tetrahedral, (d) crowdion. transverse force constant f will be negative and can become comparable to / " ( R ) . Those vibrations which do not stress the strong longitudinal force constants but the negative transverse ones will then have low frequencies (resonant modes) or even become unstable. g. defect polarizability and migration, elastic constants, and phonons.

1. Mossbauer effect measurements If suitable radioactive probe atoms are introduced into a matrix, their local environment can be studied due to the interaction of the nuclear magnetic moment of the probe nucleus with the surrounding electromagnetic field (hyperfine interaction). The probe atom can also trap self-interstitial atoms and vacancies, which can cause a change in the local electromagnetic field and thereby a change in the hyperfine interaction. In the Mossbauer measurements new "defect lines" appear in the Mossbauer spectrum, whose shift and/or splitting is characteristic of a given complex structure.

1978 and Granato et al. ) P. Ehrhart et al. 52 damping peak was also observed in ultrasonic attenuation measurements at 10 M H z (Granato et al. 1982, fig. 28b) where it is shifted to about 18 Κ in accordance with H = 14meV and τ = 3 χ 1 0 ~ s . The peak builds up upon annealing at about 40 Κ as shown in fig. 28a and its recovery occurs around 200 Κ as indicated in fig. 28b. There is an important difference between the elastic after effect and the internal friction technique: Due to the large relaxation times involved in the relaxation experiments (order of seconds to hours) the relaxation processes are observed at the lowest possible temperature and only a few defect j u m p s are required to complete the relaxation.

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